Printable Hard Sudoku

Set 1n9r8n9. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
1
7 8
9 6 1 2 4
9
3 9 1 2 6 5
5 7 8
8 9 4 6 3
4 7 1 5
1 2
Hard #2
1 8 6
6 7 9 1
9 3 5 7
9 6
4 2
2 6 7 4 3 9
3 8 1
6
8 1 9 2
Hard #3
4 2 3 5
1 6
6 8
2 9 5
7 2 4
8 5 9 7 3
9 3 4
6 1 5 9
7 5 6
Hard #4
2 8
9 5 7 4
4 8 6
9 4 5 3
3 4 9 5
1 7
2 6 5 1 4
2
5 8 4 7
Hard #5
4
8 9 1 3
9 3 6 8
7 5 1
9 1 3 2
2
9 4 7 1
8 2 9 4 6
4 9 8
Hard #6
2 8
3 6 4
8 2
6 9 4
5 7
7 3 1 6
6 3 5 9
2 7 1 3 6
5 9 1 3
Hard #7
6 5 1 2
7 8 3
8 2 7 5
7 1 4
9 2
5 1 4 7
2 9 6 8 5
5 6 2
3
Hard #8
7 5 3 4
9 5
3 8
4 6 7 2
5 3 9 1
3
8 4 5 1
9 7 8 6
9 6 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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